//I type inst
`define INST_TYPE_I 7'b0010011
`define INST_ADDI 3'b000


//R and M type inst
`define INST_TYPE_R_M 7'b0110011
//R type inst
`define INST_ADD_SUB 3'b000

//J type inst
`define INST_NOP 32'h00000013
`define INST_NOP_OP 7'b0000001